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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2013-05-29 10:19:05 -0300 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:48:27 +0900 |
| commit | fe13ea972c72bfe8c853e97b6f0ad72d1243f18b (patch) | |
| tree | 64ac32e9df3d5d163ff76cbc838c31650b3f36a9 /Documentation | |
| parent | e19226bf707844b918b38f0c8c4bc10d356edb87 (diff) | |
| download | linux-3.10-fe13ea972c72bfe8c853e97b6f0ad72d1243f18b.tar.gz linux-3.10-fe13ea972c72bfe8c853e97b6f0ad72d1243f18b.tar.bz2 linux-3.10-fe13ea972c72bfe8c853e97b6f0ad72d1243f18b.zip | |
upstream: [media] DocBook/media/v4l: clarify the QUERYSTD documentation
Explicitly mention that this ioctl should return V4L2_STD_UNKNOWN if
not signal was detected.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-querystd.xml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-querystd.xml b/Documentation/DocBook/media/v4l/vidioc-querystd.xml index fe80a183d95..22234854218 100644 --- a/Documentation/DocBook/media/v4l/vidioc-querystd.xml +++ b/Documentation/DocBook/media/v4l/vidioc-querystd.xml @@ -54,7 +54,8 @@ standard automatically. To do so, applications call <constant> VIDIOC_QUERYSTD</constant> with a pointer to a &v4l2-std-id; type. The driver stores here a set of candidates, this can be a single flag or a set of supported standards if for example the hardware can only -distinguish between 50 and 60 Hz systems. When detection is not +distinguish between 50 and 60 Hz systems. If no signal was detected, +then the driver will return V4L2_STD_UNKNOWN. When detection is not possible or fails, the set must contain all standards supported by the current video input or output.</para> |